
package com.Model;

import com.Model.Database.Database;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;


public class NotesDbAdapter {

    public static final String KEY_TITLE = "title";
    public static final String KEY_BODY = "body";
    public static final String KEY_ROWID = "_id";
    public static final String KEY_COURSE_ID = "courseId";
    private Database mDbHelper;
    private SQLiteDatabase mDb;
    private static final String DATABASE_TABLE = "Notes";
    private final Context context;


    /*
     * Constructor - takes the context to allow the database to be
     * opened/created
     * 
     * @param ctx the Context within which to work
     */
    public NotesDbAdapter(Context ctx) {
        this.context = ctx;
    }

    /*
     * Open the notes database. If it cannot be opened, try to create a new
     * instance of the database. If it cannot be created, throw an exception to
     * signal the failure
     * 
     * @return this (self reference, allowing this to be chained in an
     *         initialization call)
     * @throws SQLException if the database could be neither opened or created
     */
    public NotesDbAdapter open() throws SQLException {
        mDbHelper = new Database(context);
        mDb = mDbHelper.getWritableDatabase();
        return this;
    }
    
    public void close() {
        mDbHelper.close();
    }
   
    /*Create a new note using the title and body provided. If the note is
      successfully created return the new rowId for that note, otherwise return
      a -1 to indicate failure.
      
      @param title the title of the note
      @param body the body of the note
      @return rowId or -1 if failed
     */
    public long createNote(String title, String body, String cNo) {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_TITLE, title);
        initialValues.put(KEY_BODY, body);
        initialValues.put(KEY_COURSE_ID, cNo);
        
        
        //if no title than don't add to database
        if(title.equals("")){
        	return -1;
        }
        
        return mDb.insert(DATABASE_TABLE, null, initialValues);
        
    }
  
    /*
     * Delete the note with the given rowId
     * 
     * @param rowId id of note to delete
     * @return true if deleted, false otherwise
     */
    public boolean deleteNote(long rowId, String cNo) {

        return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId + " And " + KEY_COURSE_ID + "=" + cNo, null) > 0;
    }

    /*
     * Return a Cursor over the list of all notes in the database
     * 
     * @return Cursor over all notes
     */
    public Cursor fetchAllNotes(String cNo) {

        return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
                KEY_BODY}, KEY_COURSE_ID + "=" + cNo, null, null, null, null);

    }

    /*
     * Return a Cursor positioned at the note that matches the given rowId
     * 
     * @param rowId id of note to retrieve
     * @return Cursor positioned to matching note, if found
     * @throws SQLException if note could not be found/retrieved
     */
    public Cursor fetchNote(long rowId) throws SQLException {

        Cursor mCursor =

                mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
                        KEY_TITLE, KEY_BODY}, KEY_ROWID + "=" + rowId, null,
                        null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;

    }

    /*
     * Update the note using the details provided. The note to be updated is
     * specified using the rowId, and it is altered to use the title and body
     * values passed in
     * 
     * @param rowId id of note to update
     * @param title value to set note title to
     * @param body value to set note body to
     * @return true if the note was successfully updated, false otherwise
     */
    public boolean updateNote(long rowId, String title, String body, String cNo) {
        ContentValues args = new ContentValues();
        args.put(KEY_TITLE, title);
        args.put(KEY_BODY, body);
        args.put(KEY_COURSE_ID, cNo);

        return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId + " And " + KEY_COURSE_ID + "=" + cNo, null) > 0;
    }
        
    /*
	  * This method returns the number of notes in the database.
	  * 
	  * @return The number of notes currently in the database
	  */
	public int getNumNotes() {
		open();
		// execute the query, which counts the contacts
		Cursor cursor = mDb.query("Notes", new String[] {"COUNT(title)"}, null, null, null, null, null);
		
		// obtain the data
		int numNotes = 0;
		if (cursor.moveToFirst()) {
			numNotes = cursor.getInt(0);
		}
		cursor.close();
		
		return numNotes;
	}


}


